Expanded autolabor documentation

Because "see help function" isn't actually documentation.  Information
pulled from help function and explanations in code.
Fix beekeeping, enable help message

Plugins should now be enabled with "enable autolabor".  The beekeeping
bug was fixed in DF0.40.07, so autolabor can set multiple beekeepers
again.
Merge pull request #382 from PeridexisErrant/autolabor-fixes

Autolabor fixes